Search for notes by fellow students, in your own course and all over the country.
Browse our notes for titles which look like what you need, you can preview any of the notes via a sample of the contents. After you're happy these are the notes you're after simply pop them into your shopping cart.
Title: Windmills
Description: These are very important notes are mainly for year 9 to 10.
Description: These are very important notes are mainly for year 9 to 10.
Document Preview
Extracts from the notes are below, to see the PDF you'll receive please use the links above
How Windmills Work
Most modern windmills (some people call them wind turbines by the way) have three
blades
...
And most modern windmills rotate clockwise
...
But if you see a
windmill in Britain and it’s rotating anti clockwise – you’re looking at it from behind
...
One of the main jobs is to keep the windmill
facing the wind
...
With this data the ‘hub’ of the windmill (the
bit the three blades are attached to) is kept turned so that the blades are always facing
into the wind
...
Windmills might shed the wind in a gale for example (when there’s too much energy
in the wind) or if there was a fault with the grid or the windmill itself
...
These blades are connected to a generator, sometimes through a gearbox (in what’s
known as ‘fixed speed’ machines) and sometimes connected directly (in what are
known as ‘variable speed’ or ‘direct drive’ machines) – in both cases the generator
converts the mechanical energy – the rotation of the blades – into electrical energy
...
Fixed speed machines run at one speed of rotation, whatever the wind speed
...
Fixed speed windmills use a gearbox to create electricity at the right frequency for the
grid, 50Hz for the UK
...
In both cases, once the electricity is made, and made suitable to enter the local grid,
that’s where we send it - via underground cables
...
The energy payback of a modern windmill (the time it takes to get back the energy
used to manufacture and install each windmill) is between 6 and 9 months –
depending on location (some places are more windy than others)
...
Title: Windmills
Description: These are very important notes are mainly for year 9 to 10.
Description: These are very important notes are mainly for year 9 to 10.